<template>
  <div>
    <!-- 数据报表 -->
    <!-- 面包屑导航 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>数据统计</el-breadcrumb-item>
      <el-breadcrumb-item>数据报表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片区域 -->
    <el-card>
      <!-- 2.为ECharts准备一个具备大小（宽高）的Dom -->
      <div id="main" style="width: 700px;height:400px;"></div>
    </el-card>
  </div>
</template>

<script>
  //1.导入echarts
  import * as echarts from 'echarts'
  //导入lodash
  import _ from 'lodash'

  export default {
    name:'Report',
    data() {
      return {
        //需要合并的数据
        options: {
          title: {
            text: '用户来源'
          },
          tooltip: {
            trigger: 'axis',
            axisPointer: {
              type: 'cross',
              label: {
                backgroundColor: '#E9EEF3'
              }
            }
          },
          grid: {
            left: '3%',
            right: '4%',
            bottom: '3%',
            containLabel: true
          },
          xAxis: [
            {
              boundaryGap: false
            }
          ],
          yAxis: [
            {
              type: 'value'
            }
          ]
        }
      }
    },
    //执行到mounted函数，证明页面上的DOM元素初始化渲染完毕
    async mounted() {
      //3.基于准备好的dom，初始化echarts实例
      var myChart = echarts.init(document.getElementById('main'));

      //发起获取折线图请求
      const {data} = await this.$http.get('reports/type/1')
      if(data.meta.status !== 200) {
        return this.$message.error('获取折线图失败!')
      }

      //4.指定图表的配置项和数据
      const res = _.merge(data.data,this.options)
      //5.使用刚指定的配置项和数据显示图表数据。
      myChart.setOption(res);
    }
  }
</script>

<style scoped>

</style>